Physical performance, time-motion, technical-tactical analyses, and perceptual responses in brazilian jiu-jitsu matches of varied duration

This study aimed to analyze performance, time structure, technical actions, and perceptual responses of Brazilian jiu-jitsu athletes during matches of varied duration. For this, 10 athletes were analyzed in matches of varied duration (2-min, 5-min, 8-min and 10-min). Physical tests (reaction time, maximal isometric handgrip strength, grip strength endurance, vertical jump and sit-and-reach) and perceptive scales (exertion and recovery) were applied before and immediately after a combat. The matches were recorded for technicaltactical analysis and to determine their time structure. The main results showed that alterations were observed for the grip strength with kimono (p=.001), whereas a decrease was observed in the suspension time in the 8-min (p=.017) and 10-min (p=.002) combats compared to pre-match mean values. The rating of perceived exertion was influenced by time (p<.001), with higher values reported after combats of 8-min and 10-min duration compared to 2-min combat (p=.008 and p=.001; respectively). The effort:pause ratio did not differ between the times of combats (p=.472), but the pause time differed according to match duration (p=.004), with higher values observed in the 10-min combats than in the 2-min combats (p=.002). Thus, it was concluded that combats of longer duration resulted in higher perceived exertion, higher pause time and lower strength endurance

Metabolic, muscle damage and heart rate responses in brazilian jiu-jitsu matches of varied duration

The aim of this study was to analyze physiological responses in Brazilian jiu-jitsu (BJJ) athletes during matches of varied duration. To this end, 10 athletes (age: 29±5 years old, body mass: 77.5±6.3 kg, body fat: 10.0±5.2%, systematic BJJ practice: 10±2 years) were analyzed in matches of varied duration (2-min, 5-min, 8-min and 10-min). Blood collection was performed to determine energetic demands, hormonal responses and muscle damage. The main results showed that a longer duration of combat generated higher lactate (p<.001) and glucose (p=.004) concentrations. However, when the data were corrected for the effort time, higher lactate concentrations (p<.001) and higher heart rates (p<.001) were found in shorter duration combats. No changes were observed concerning insulin (p=.870), triglycerides (p=.219), total cholesterol (p=.170), albumin (p=.060) and urea (p=.772) values. For markers of muscle damage, no alterations were detected for creatine kinase (p=.401). However, evidence of muscle damage was found, as increased lactate desidrogenase (p=.012) and creatinine (p=.002) concentrations were observed, particularly in the matches of a longer duration. Thus, it is concluded that different combat times have a direct influence on the physiological, hormonal and metabolic responses

Acute Capsaicin Analog Supplementation Improves 400 M and 3000 M Running Time-Trial Performance

International Journal of Exercise Science 13(2): 755-765, 2020. Objectives: Performance in running-based sport depends on the ability to perform repetitive high intensity muscle contractions. Previous studies have shown that capsaicin analog (CAP) (i.e. Capsiate) supplementation may improve this performance. The purpose of this study was to investigate the acute effect of CAP supplementation on short (400 m) and middle distance (3000 m) running time-trial performance, maximum heart rate (HR), and rate of perceived exertion (RPE). Methods: Twelve physically active men completed four randomized, double-blind trials: CAP condition (12 mg) or a placebo condition. Forty-five minutes after supplementation, the participants performed a 400- or 3000-meter running time trial. Time (in seconds) was recorded. HR was analyzed at rest and immediately post-exercise, and RPE was collected immediately after exercise. Results: For both the 400 m time-trial (CAP = 66.4 + 4.2 sec vs Placebo = 67.1 + 4.8 sec, p = 0.046) and the 3000 m time-trial (CAP = 893.9 ± 46.8 sec vs Placebo = 915.2 ± 67.6 sec, p = 0.015), the time in seconds was significantly less in the CAP compared to placebo conditions. There were no statistically significant differences for HR and RPE in any condition. Conclusion: In summary, acute CAP supplementation improved 400 m and 3000 m running time-trial performance in a distance-dependent way but without modifying the HR and RPE

Effects of interval time between high-intensity intermittent aerobic exercise on strength performance: analysis in individuals with different training background

This study aimed to analyze the effect of the time interval after high-intensity aerobic exercise on strength performance in individuals with different training backgrounds. Participants (n = 27) were divided into three groups according to their training backgrounds (aerobic, strength or concurrent) and submitted to eight sessions: (1) determination of the peak velocity (Vpeak) during the incremental treadmill test to exhaustion and familiarization of the evaluation of maximum strength (1RM) for the half-squat; (2) 1RM determination; and (3-8) randomly assigned experimental sessions consisting of either a strength exercise (SE), four sets at 80% of the 1RM, in which maximum number of repetitions (MNR) and the total volume performed (TV) was computed, and five sessions consisting of high-intensity intermittent aerobic exercise (100% of Vpeak - 1 min:1 min) totaling 5 km, followed by a SE with varying recovery intervals between activities (30, 60 minutes, 4, 8, and 24 hours). Comparisons for MNR and TV were made using two-way variance analysis (group and time interval) with repeated measures in the second factor. When significant differences were detected (P < 0.05), a Bonferroni and Dunnet post-hoc test were used. There was an effect of group for MNR, with the Aerobic Group performing a higher MNR compared to Strength Group (P = 0.002). Moreover, there was an effect of the time interval for MNR and TV, with reduction after 30 (P < 0.001 for both variables) and 60 minutes intervals (P = 0.035; P = 0.007, respectively) compared to the control condition. Thus, it is concluded that the drop in performance related to the SE activity occurred with the same magnitude and time interval for each of the groups.This study was supported by FAPESP (2009/03391-5) and CNPq (470634/2010-3)

Differences in metabolic and inflammatory responses in lower and upper body high-intensity intermittent exercise

The purpose of this study was to compare the effect of upper and lower body high-intensity intermittent exercise (HIIE) on immunometabolism profile.Seven male judo athletes completed two experimental sessions separated by at least 48 h. The athletes completed four bouts of the upper and lower body Wingate tests separated by 3-min recovery periods. The blood samples were collected at rest and immediately after the fourth bout of lower and upper body Wingate tests. Serum was analysed for IL-1ra (Interleukin-1 Receptor Antagonist), interleukins (IL-1) IL-2, IL-4, IL-6, IL-10, TNF-alpha (tumor necrosis factor alpha), cortisol, glucose, and NEFA (non-ester fatty acid). Peak power (maximum power attained during the 30 s test), mean power were calculated. In addition, after 1 and 2.5-min of each Wingate bout, blood samples from the ear lobe were collected for lactate analysis.Our data demonstrated that lower body HIIE promoted a greater metabolic rate (values pre- vs. post-Wingate, for lactate: 1.02 +/- A 0.16 vs. 14.44 +/- A 1.08 mmol/L; for glucose: 112.5 +/- A 16.7 vs. 147.9 +/- A 23.5 mg/dL) and resulted in higher mechanical (mean power: 621 +/- A 46 vs. 427 +/- A 40 W, peak power: 794 +/- A 61 vs. 602 +/- A 109 W) performance compared to the upper body HIIE (lactate: 0.85 +/- A 0.18 vs. 12.69 +/- A 0.74 mmol/L; for glucose: 115.3 +/- A 20.4 vs. 123.7 +/- A 28.6 mg/dL; mean power: 480 +/- A 46 vs. 341 +/- A 45 W; and peak power: 672 +/- A 83 vs. 501 +/- A 120 W), but NEFA showed a similar response to both conditions, with increased IL-10 levels.In conclusion, our results demonstrated that despite the higher performance in lower body HIIE, the inflammatory response did not differ between exercise modalities.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP

Moderate Intensity Arm Cycling as a Viable Exercise Alternative for Overfat and Obese Individuals with Poor Cardiorespiratory Fitness

The prescription of aerobic exercise engaging the arms may extend the reach of physical activity and improve cardiorespiratory fitness in individuals with obesity. PURPOSE: This study compared the acute cardiopulmonary responses obtained during isocaloric arm and leg cycling trials performed at different intensities among individual’s with and without excess body fat. METHODS: Participants were 37 young adults divided into two groups based on their fat mass index, lean and average (LA) and overfat and obese (OFO). They were tested for mode-specific work rate at the ventilatory threshold (VT) and volitional fatigue (VF) during two randomized ramp tests. The main experiments consisted of four randomized constant work rate isocaloric trials for arm and leg cycling performed at moderate (i.e., work rate equivalent to 80% of VT obtained during the ramp tests) and heavy (i.e., work rate equivalent to 30% of the difference between VT and VF obtained during the ramp tests). The time to expend 100 kcal (Tkcal100) was recorded, and oxygen uptake (V̇O2) was averaged for the duration of the tests. A two-way mixed factorial ANCOVA with physical activity level as a covariate determined work rate at VT, and V̇O2 peak responses to the ramp tests. A three-way mixed factorial ANCOVA with the mode-specific fitness difference and physical activity level as covariates were run for Tkcal100 and V̇O2 obtained during isocaloric trials. Effect sizes (Cohen’s d) were calculated and interpreted with magnitude thresholds and significance level was set at p≤0.05. RESULTS: Significantly lower work rates at VT and V̇O2 peak were shown for the OFO during ramp tests. Tkcal100 was significantly longer for OFO in comparison to LA during isocaloric trials (d=0.36). The V̇O2 responses relative to body mass were significantly greater in leg cycling than arm cycling, while effect sizes were larger during heavy exercise (d=1.45) compared to moderate (d=1.13). CONCLUSION: Arm cycling performed at moderate intensity could be an alternative for young adults with excess body fat and poor cardiorespiratory fitness since this exercise modality elicited a sufficient metabolic response above three metabolic equivalents, which is within the moderate intensity domain suggested by current guidelines

Short-term high- and moderate-intensity training modifies inflammatory and metabolic factors in response to acute exercise

To compare the acute and chronic effects of high intensity intermittent training (HIIT) and steady state training (SST) on the metabolic profile and inflammatory response in physically active men. Thirty recreationally active men were randomly allocated to a control group (n = 10), HIIT group (n = 10), or SST group (n = 10). For 5 weeks, three times per week, subjects performed HIIT (5 km 1-min at 100% of maximal aerobic speed interspersed by 1-min passive recovery) or SST (5 km at 70% of maximal aerobic speed) while the control group did not perform training. Blood samples were collected at fasting (~12 h), pre-exercise, immediately post, and 60 min post-acute exercise session (pre- and post-5 weeks training). Blood samples were analyzed for glucose, non-ester fatty acid (NEFA), and cytokine (IL-6, IL-10, and TNF-α) levels through a three-way analysis (group, period, and moment of measurement) with repeated measures in the second and third factors. The results showed an effect of moment of measurement (acute session) with greater values to TNF-α and glucose immediately post the exercise when compared to pre exercise session, independently of group or training period. For IL-6 there was an interaction effect for group and moment of measurement (acute session) the increase occurred immediately post-exercise session and post-60 min in the HIIT group while in the SST the increase was observed only 60 min post, independently of training period. For IL-10, there was an interaction for training period (pre- and post-training) and moment of measurement (acute session), in which in pre-training, pre-exercise values were lower than immediately and 60 min post-exercise, in post-training period pre-exercise values were lower than immediately post-exercise and immediately post-exercise lower than 60 min post, it was also observed that values immediately post-exercise were lower pre- than post-training, being all results independently of intensity (group). Our main result point to an interaction (acute and chronic) for IL-10 showing attenuation post-training period independent of exercise intensity.8856FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP2016/16712-8; 2016/12145-1; 2015/12979-7; 2015/11302-

The acute effects of thermogenic fitness drink formulas containing 140 mg and 100 mg of caffeine on energy expenditure and fat metabolism at rest and during exercise

Background Thermogenic fitness drink formulas (TFD) have been shown to increase energy expenditure and markers of lipid metabolism. The purpose of the current study was to compare TFD formulas containing different caffeine concentrations versus a placebo drink on energy expenditure and lipid metabolism at rest and during exercise. Methods Thirty-two recreationally active participants (22.9 ± 0.7 y, 167.1 ± 1.4 cm, 68.8 ± 2.0 kg, 24.0 ± 1.2% fat) who were regular caffeine consumers, participated in this randomized, double-blind, crossover design study. Participants reported to the laboratory on three occasions, each of which required consumption of either a TFD containing 140 mg or 100 mg of caffeine or a placebo. Baseline measurements of resting energy expenditure (REE) and resting fat oxidation (RFO) were assessed using indirect calorimetry as well as measurements of serum glycerol concentration. Measurements were repeated at 30, 60, 90 min post-ingestion. Following resting measures, participants completed a graded exercise test to determine maximal oxygen uptake (V̇O2max), maximal fat oxidation (MFO) and the exercise intensity that elicits MFO (Fatmax), and total energy expenditure (EE). Results A significant interaction was shown for REE (p < 0.01) and RFO (p < 0.01). Area under the curve analysis showed an increased REE for the 140 mg compared to the 100 mg formula (p = 0.02) and placebo (p < 0.01) and an increased REE for the 100 mg formula compared to placebo (p = 0.02). RFO significantly decreased for caffeinated formulas at 30 min post ingestion compared to placebo and baseline (p < 0.01) and significantly increased for the 140 mg formula at 60 min post-ingestion (p = 0.03). A main effect was shown for serum glycerol concentrations over time (p < 0.01). No significant differences were shown for V̇O2max (p = 0.12), Fatmax (p = 0.22), and MFO (p = 0.05), and EE (p = 0.08) across drinks. Conclusions Our results suggest that TFD formulas containing 100 and 140 mg of caffeine are effective in increasing REE and that a 40 mg of caffeine difference between the tested formulas may impact REE and RFO in healthy individuals within 60 min of ingestion